Ammonite shell fossil for sale found near Whitby, North Yorkshire on the Jurassic Coast
Squared top with a strong keel bordered either side by a groove are distinctive features. Spiral groove (indentation on the side of the whorls) and sloping umbilical wall (bottom edge of the whorl). Curved sickle-shaped ribs, which are strongest above the spiral groove. Can reach large size (over 6 inches), although 4 inches or less more common. A more slender and fine ribbed form/species Hildoceras semipolitum (Buckman, 1902) can be found at Ravencar.
Actual ammonite size: 7.8cm
Age (lithology): Upper Lias; Toarcian; Bifrons zone; Fibulatum and Crassum subzones.
Distribution: Port Mulgrave, Kettleness, Sandsend, Saltwick, Runswick, Hawsker, Ravenscar.
Occurrence: Common
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